[Pharo-project] Class not showing in the browser

Hi, I'm having a problem when filing in classes from Squeak, the do not appear in the browser althoug they are in the image. Does somebody know how to fix it? BTW, I fixed a bug when trying to redefine a class. If you press the button "Cancel" (not the option cancel) it does not work. How do I summit the fix? (sorry for asking this to the list, but I do not have too much time to look in the web page to see how to do it...) Hernan.